Why does gmail spell check highlight partial words?

I recently received the latest version of Firefox for my Windows XP desktop computer. Since that time, when I type e-mails the spell check puts a wiggly red line under parts of a word. When I click to spell check the entire e-mail, parts of correctly spelled words are highlighted in yellow and the dictionary tries to provide spellings for these highlighted parts of each word. I have gone into Firefox options and unchecked the box for spell checking as I type. That did not help. What can I do to fix this problem?

I recently received the latest version of Firefox for my Windows XP desktop computer. Since that time, when I type e-mails the spell check puts a wiggly red line under parts of a word. When I click to spell check the entire e-mail, parts of correctly spelled words are highlighted in yellow and the dictionary tries to provide spellings for these highlighted parts of each word. I have gone into Firefox options and unchecked the box for spell checking as I type. That did not help. What can I do to fix this problem?

Chosen solution

If you're using an add-on, you can try to Disable it in Tools (Alt + T) > Add-ons > Extensions. Please note that Gmail has a spell check function, so if the problem persists, you may have to disable the Gmail spell check. The Gmail support would also be helpful.

Chosen Solution

If you're using an add-on, you can try to Disable it in Tools (Alt + T) > Add-ons > Extensions. Please note that Gmail has a spell check function, so if the problem persists, you may have to disable the Gmail spell check. The Gmail support would also be helpful.

Hi,
You can update Firefox via '''Help''' ('''Alt''' + '''H''') > '''About Firefox''', or from https://www.mozilla.org/en-US/firefox/new/
[https://www.mozilla.org/en-US/firefox/update/ Updating]
If you're using an add-on, you can try to '''Disable''' it in '''Tools''' ('''Alt''' + '''T''') > '''Add-ons''' > '''Extensions'''. Please note that Gmail has a spell check function, so if the problem persists, you may have to disable the Gmail spell check. The [https://productforums.google.com/forum/#!forum/gmail Gmail support] would also be helpful.
[https://support.mozilla.org/en-US/kb/Using%20extensions%20with%20Firefox Using extensions]

I have this problem too, and the latest updates have not resolved it.
I submitted a separate question describing the problem in more technical detail: [https://support.mozilla.org/en-US/questions/942328 insertion of font tags]